Hypothesis Development
Although a number of different safety and quality measures are
examined, these variables only measure three concepts. Both INJ1
and INJ2 examine safety from the perspective of recorded worker
injuries of varying severity. On the other hand, there are two basic
measures of quality that were deemed relevant, the first of which is
defects as evaluated by Q1 and Q2, the second of which is rework
as measured through Q2, Q4, Q5, and Q6. Because these measures
compress into three distinct concepts, two fundamental hypotheses
were developed:
• H1: There is a relationship between rework and safety.
• H2: There is a relationship between defects and safety.
These hypotheses have been restated as null and alternative
hypothesis in Table 4 along with their independent and dependent
variables.